title: Remediation of TCE-contaminated groundwater using acid/BOF slag enhanced chemical oxidation.
abstract: The objective of this study was to evaluate the potential of applying acid/H(2)O(2)/basic oxygen furnace slag (BOF slag) and acid/S(2)O(8)(2-)/BOF slag systems to enhance the chemical oxidation of trichloroethylene (TCE)-contaminated groundwater. Results from the bench-scale study indicate that TCE oxidation via the Fenton-like oxidation process can be enhanced with the addition of BOF slag at low pH (pH=2-5.2) and neutral (pH=7.1) conditions. Because the BOF slag has iron abundant properties (14% of FeO and 6% of Fe(2)O(3)), it can be sustainably reused for the supplement of iron minerals during the Fenton-like or persulfate oxidation processes. Results indicate that higher TCE removal efficiency (84%) was obtained with the addition of inorganic acid for the activation of Fenton-like reaction compared with the experiments with organic acids addition (with efficiency of 10-15% lower) (BOF slag=10gL(-1); initial pH=5.2). This could be due to the fact that organic acids would compete with TCE for available oxidants. Results also indicate that the pH value had a linear correlation with the observed first-order decay constant of TCE, and thus, lower pH caused a higher TCE oxidation rate.
authors.affiliation: Integrated Research Center for Green Living Technologies, National Chin-Yi University of Technology, Taichung, Taiwan.
authors.forename: T T
authors.initials: TT
authors.lastname: Tsai
authors.forename: C M
authors.initials: CM
authors.lastname: Kao
authors.forename: J Y
authors.initials: JY
authors.lastname: Wang
mesh_terms: D005618:Fresh Water / Q000737:chemistry*; D006861:Hydrogen Peroxide / Q000737:chemistry; D006863:Hydrogen-Ion Concentration; D016877:Oxidants / Q000737:chemistry; D010084:Oxidation-Reduction; D013463:Sulfuric Acid Esters / Q000737:chemistry; D014241:Trichloroethylene / Q000032:analysis / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000032:analysis / Q000737:chemistry*
chemical_list: D016877:Oxidants; D013463:Sulfuric Acid Esters; D014874:Water Pollutants, Chemical; D014241:Trichloroethylene; D006861:Hydrogen Peroxide